纳米笼
材料科学
分解
金属有机骨架
纳米技术
共形映射
金属
化学工程
物理化学
冶金
吸附
生态学
数学分析
生物化学
化学
数学
工程类
生物
催化作用
作者
Shin Joon Kang,Minjoon Hong,Jong Ho Won,Byungchan Han,Jeung Ku Kang,Hyung Mo Jeong
标识
DOI:10.1002/aenm.202402651
摘要
Abstract Li─O 2 batteries (LOBs) have the largest theoretical capacity among current batteries, but the irreversible growth and decomposition of Li 2 O 2 products in positive electrodes cause dramatic degradation of their capacities over charging–discharging cycles. Herein, a metal–organic framework is reported with bipyridinic N linkers attached to graphene (bpyN‐MOF/g) as a positive electrode material to overcome the challenge. The bpyN‐MOF/g promotes conformal Li 2 O 2 growth during discharging, while allowing Li 2 O 2 decomposition at a low overpotential (0.487 V vs Li + /Li at 200 mA g c −1 ) during charging process, outperforming the Pt/C‐based electrode (0.857 V). Moreover, 3D‐tomography and density functional theory calculations consistently support the Li 2 O 2 growth and decomposition mechanism inside bpyN‐MOF/g. Furthermore, bpyN‐MOF/g//Li LOBs achieve an exceptional discharge capacity (17 275 mAh g c −1 at 100 mA g c −1 ) and steady cycling for 270 cycles at 1000 mAh g c −1 under 2000 mA g c −1 . Additionally, high gravimetric capacity at low mass loadings (0.27–0.44 mg cm −2 ) and stable cycle operation at a high areal current density (0.5 mA cm −2 ) open new opportunities for various practical applications.
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